rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=ba9c/1/0x4000000000000000 softirq=19966/19967 fqs=76
rcu: (t=10501 jiffies g=16113 q=316 ncpus=2)
rcu: rcu_preempt kthread starved for 10350 jiffies! g16113 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27312 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x313/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7696 Comm: syz.5.424 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: 40 22 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d c3 29 43 00 fb f4 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2e 41 89 de 80
RSP: 0018:ffffc9000b94f878 EFLAGS: 000002d3
RAX: ffffffff813aa578 RBX: 0000000000000003 RCX: ffff888023a75a00
RDX: 0000000000000000 RSI: ffffffff8acac960 RDI: ffffffff8b1c85a0
RBP: ffffc9000b94f950 R08: ffffffff911c15ff R09: 1ffffffff22382bf
R10: dffffc0000000000 R11: fffffbfff22382c0 R12: dffffc0000000000
R13: 0000000000000200 R14: 0000000000000003 R15: 1ffff92001729f14
FS: 000055557cbda500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc6ca04ff0 CR3: 0000000064749000 CR4: 00000000003506f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
kvm_wait+0x23d/0x2a0 arch/x86/kernel/kvm.c:1058
pv_wait arch/x86/include/asm/paravirt.h:598 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
__pv_queued_spin_lock_slowpath+0x61a/0x9d0 kernel/locking/qspinlock.c:511
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:586 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x23e/0x2c0 kernel/locking/spinlock_debug.c:115
spin_lock include/linux/spinlock.h:351 [inline]
futex_unqueue+0x4e/0xf0 kernel/futex/core.c:597
futex_wait+0x1f4/0x5e0 kernel/futex/waitwake.c:660
do_futex+0x2ff/0x3e0 kernel/futex/syscalls.c:134
__do_sys_futex kernel/futex/syscalls.c:211 [inline]
__se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1a2019c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff53fd03c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000005a3e0 RCX: 00007f1a2019c799
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1a20415fac
RBP: 0000000000000032 R08: 0000000000745a1d R09: 0000000000000000
R10: 00007fff53fd04d0 R11: 0000000000000246 R12: 00007fff53fd04f0
R13: 00007f1a20415fac R14: 000000000005a412 R15: 00007fff53fd04d0
CPU: 1 PID: 7699 Comm: syz.5.424 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__nr_to_section include/linux/mmzone.h:1849 [inline]
RIP: 0010:__pfn_to_section include/linux/mmzone.h:1957 [inline]
RIP: 0010:lookup_page_ext mm/page_ext.c:237 [inline]
RIP: 0010:page_ext_get+0x11b/0x2b0 mm/page_ext.c:509
Code: 85 95 01 00 00 48 c7 c0 a0 28 32 97 48 c1 e8 03 42 80 3c 20 00 74 0c 48 c7 c7 a0 28 32 97 e8 0c 1f f5 ff 48 8b 05 55 fc 47 15 <48> 85 c0 74 42 4c 89 f1 48 c1 e9 16 4c 8d 3c c8 4c 89 f8 48 c1 e8
RSP: 0018:ffffc900001ee8c0 EFLAGS: 00000246
RAX: ffff88823ffef000 RBX: ffffffff81ea2b52 RCX: ffff888024745a00
RDX: 0000000000000100 RSI: 000000000007d4a4 RDI: 00000003ffffffff
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff22382a0
R10: dffffc0000000000 R11: fffffbfff22382a1 R12: dffffc0000000000
R13: ffffc900001eeb08 R14: 000000000007d4a4 R15: ffffea0001f52900
FS: 00007f1a2104b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000064749000 CR4: 00000000003506e0
Call Trace:
__page_table_check_zero+0x138/0x4b0 mm/page_table_check.c:148
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
__stack_depot_save+0x435/0x630 lib/stackdepot.c:410
save_stack+0x133/0x230 mm/page_owner.c:129
__set_page_owner+0x1d/0x60 mm/page_owner.c:192
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
prep_new_page mm/page_alloc.c:1588 [inline]
get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
__alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
__stack_depot_save+0x435/0x630 lib/stackdepot.c:410
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_set_track+0x5f/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x270 mm/slub.c:3852
packet_rcv+0x16b/0x13d0 net/packet/af_packet.c:2278
dev_queue_xmit_nit+0xb16/0xbb0 net/core/dev.c:2385
xmit_one net/core/dev.c:3628 [inline]
dev_hard_start_xmit+0x148/0x740 net/core/dev.c:3648
sch_direct_xmit+0x25e/0x4c0 net/sched/sch_generic.c:345
__dev_xmit_skb net/core/dev.c:3869 [inline]
__dev_queue_xmit+0x165d/0x3660 net/core/dev.c:4404
neigh_output include/net/neighbour.h:543 [inline]
ip_finish_output2+0xd3a/0x11e0 net/ipv4/ip_output.c:235
NF_HOOK_COND include/linux/netfilter.h:293 [inline]
ip_output+0x2a1/0x3b0 net/ipv4/ip_output.c:436
dst_output include/net/dst.h:467 [inline]
ip_local_out net/ipv4/ip_output.c:129 [inline]
__ip_queue_xmit+0x1049/0x1950 net/ipv4/ip_output.c:540
__tcp_transmit_skb+0x1d6b/0x33f0 net/ipv4/tcp_output.c:1425
tcp_ack_snd_check net/ipv4/tcp_input.c:5736 [inline]
tcp_rcv_established+0xb06/0x1d20 net/ipv4/tcp_input.c:6182
tcp_v4_do_rcv+0x4ed/0xb80 net/ipv4/tcp_ipv4.c:1734
tcp_v4_rcv+0x23bf/0x2af0 net/ipv4/tcp_ipv4.c:2166
ip_protocol_deliver_rcu+0x20e/0x3f0 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x2ca/0x510 net/ipv4/ip_input.c:233
NF_HOOK+0x32d/0x3b0 include/linux/netfilter.h:304
dst_input include/net/dst.h:477 [inline]
ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline]
ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline]
ip_sublist_rcv+0xa4c/0xd70 net/ipv4/ip_input.c:639
ip_list_rcv+0x3f2/0x440 net/ipv4/ip_input.c:674
__netif_receive_skb_list_ptype net/core/dev.c:5677 [inline]
__netif_receive_skb_list_core+0x583/0x750 net/core/dev.c:5725
__netif_receive_skb_list net/core/dev.c:5777 [inline]
netif_receive_skb_list_internal+0x943/0xca0 net/core/dev.c:5868
gro_normal_list include/net/gro.h:451 [inline]
gro_normal_one include/net/gro.h:464 [inline]
napi_gro_complete+0x2db/0x6f0 net/core/gro.c:264
dev_gro_receive+0x19cd/0x22c0 net/core/gro.c:502
napi_gro_receive+0x381/0xb00 net/core/gro.c:605
receive_buf+0x2203/0x3820 drivers/net/virtio_net.c:1870
virtnet_receive drivers/net/virtio_net.c:2155 [inline]
virtnet_poll+0x5dd/0x1280 drivers/net/virtio_net.c:2229
__napi_poll+0xc0/0x460 net/core/dev.c:6638
napi_poll net/core/dev.c:6705 [inline]
net_rx_action+0x616/0xc40 net/core/dev.c:6841
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:plist_del+0x0/0x3f0 lib/plist.c:113
Code: f1 80 e1 07 80 c1 03 38 c1 0f 8c f5 fc ff ff 4c 89 f7 e8 f3 e8 6a f7 e9 e8 fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <66> 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 28 48 89 f3 49
RSP: 0018:ffffc9000b9ffba8 EFLAGS: 00000246
RAX: ffffffff817b2f1f RBX: ffffc9000b94fc50 RCX: 0000000000080000
RDX: ffffc9000ec30000 RSI: ffffc90000a28bc8 RDI: ffffc9000b94fc50
RBP: 0000000000000001 R08: ffff888023a75a2b R09: 1ffff1100474eb45
R10: dffffc0000000000 R11: ffffed100474eb46 R12: dffffc0000000000
R13: ffffc9000b94fc80 R14: ffffc90000a28b80 R15: ffffc90000a28b88
__futex_unqueue+0xf0/0x160 kernel/futex/core.c:518
futex_wake_mark+0xec/0x150 kernel/futex/waitwake.c:123
futex_wake+0x32f/0x4f0 kernel/futex/waitwake.c:177
do_futex+0x35d/0x3e0 kernel/futex/syscalls.c:139
__do_sys_futex kernel/futex/syscalls.c:211 [inline]
__se_sys_futex+0x3a9/0x440 kernel/futex/syscalls.c:192
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1a2019c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1a2104b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f1a20415fa8 RCX: 00007f1a2019c799
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f1a20415fac
RBP: 00007f1a20415fa0 R08: 0000000000745a1d R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1a20416038 R14: 00007fff53fd0180 R15: 00007fff53fd0268